Lasers in Medical Science

, Volume 24, Issue 1, pp 59–65 | Cite as

The impact of an erbium, chromium:yttrium-scandium-gallium-garnet laser with radial-firing tips on endodontic treatment

  • U. SchoopEmail author
  • A. Barylyak
  • K. Goharkhay
  • F. Beer
  • J. Wernisch
  • A. Georgopoulos
  • W. Sperr
  • A. Moritz
Original Article


Radial-firing tips should allow a more homogeneous laser irradiation of root canal walls. The aim of the study was to assess the effects of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation in conjunction with those newly designed tips. The investigation comprised bacteriology, morphological evaluations and temperature measurements. Root canals were inoculated with two test strains and laser irradiated with power settings of 0.6 W and 0.9 W and a repetition rate of 20 Hz. Subsequently, the samples were subjected to microbiological evaluation. The morphological changes of the canal walls were assessed by scanning electron microscopy. To reveal possible thermal side effects, we carried out temperature measurements. The bacteriological evaluation revealed a decisive disinfectant effect. Scanning electron microscopy showed the homogeneous removal of smear layer from the root canal walls. The temperature rise at the root surface during the irradiation was moderate, yielding 1.3°C for the 0.6 W setting and 1.6°C for the 0.9 W setting. The investigations indicated that the Er,Cr:YSGG laser, in conjunction with radial-firing tips, is a suitable tool for the elimination of bacteria in root canals and for the removal of smear layer.


Endodontics Root canal Laser Radial-firing tips Bacteriology Scanning electron microscopy 


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Copyright information

© Springer-Verlag London Limited 2007

Authors and Affiliations

  • U. Schoop
    • 1
    Email author
  • A. Barylyak
    • 2
  • K. Goharkhay
    • 1
  • F. Beer
    • 1
  • J. Wernisch
    • 3
  • A. Georgopoulos
    • 4
  • W. Sperr
    • 1
  • A. Moritz
    • 1
  1. 1.Department of Conservative Dentistry, Dental SchoolMedical University of ViennaViennaAustria
  2. 2.Department of Therapeutic DentistryDanylo Halytskyy Lviv Medical UniversityLvivUkraine
  3. 3.Institute for Applied and Technical PhysicsTechnical University of ViennaViennaAustria
  4. 4.Department of Infectious Diseases and ChemotherapyUniversity Clinic for Internal Medicine IViennaAustria

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